Kinetics of vapor-phase electrochemical oxidative dehydrogenation of ethylbenzene
The vapor-phase electrochemical oxidative dehydrogenation of ethylbenzene to styrene was studied at 575/sup 0/C and atmosperhic pressure on a polycrystalline platinum electrocatalyst in a stabilized zirconia electrochemical reactor. Electrochemical supply of oxygen to the electrocatalytic surface increases both the dehydrogenation rate and the deep oxidation rate. Carbon dioxide formation is oxygen-limited and its rate is linear in current density. The dehydrogenation rate is enhanced as much as 600% by moderate current densities; this electrocatalytic enhancement reaches an ethylbenzene-concentration-dependent asymptote at larger current densities. Addition of gas-phase hydrogen suppresses both the deep oxidation rate and the current-induced increase of the dehydrogenation rate. A two-site Langmuir-Hinshelwood type reaction mechanism is proposed which quantitatively describes these results from a surface oxidative dehydrogenation step in which adsorbed ethylbenzene reacts with oxidized surface sites to form styrene and water.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge
- DOE Contract Number:
- AC02-80ER10694
- OSTI ID:
- 6942772
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 85:2; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
AROMATICS
BENZENE
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CHEMISTRY
DATA
DEHYDROGENATION
ELECTROCHEMISTRY
ELEMENTS
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
KINETICS
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
REACTION KINETICS
STYRENE
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES